A few probability problems...

I'm stumped on these questions I have no idea how to figure them out. Any help at all would be greatly appreciated.

1. A mountain search and rescue team receives an average of .83 calls per day. Find the probability that on a randomly selected day, they will receive more than two calls.

2. For a type of fabric, the average number of defects in each square foot is .78. Find the probability that a randomly selected square foot of fabric will contain more than 1 defect.

3. A sample of 4 different calculators are randomly selected from a group containing 13 that are defective and 30 with no defects. What is the probability that at least one of the calculators is defective?

I'm stumped on these questions I have no idea how to figure them out. Any help at all would be greatly appreciated.

1. A mountain search and rescue team receives an average of .83 calls per day. Find the probability that on a randomly selected day, they will receive more than two calls.

2. For a type of fabric, the average number of defects in each square foot is .78. Find the probability that a randomly selected square foot of fabric will contain more than 1 defect.

3. A sample of 4 different calculators are randomly selected from a group containing 13 that are defective and 30 with no defects. What is the probability that at least one of the calculators is defective?

Thanks for the help!

1. The number of calls can probably be assumed to be modelled using a Poisson distribution.

2. The number of defects can probably be assumed to be modelled using a Poisson distribution.